https://bugs.webkit.org/show_bug.cgi?id=112824
<rdar://problem/15091882>

Reviewed by Eric Carlson (and Ian Henderson offline).

Source/WebCore:

Implement a new 2d matrix blend, which is triggered
when animating between two affine 3d matrices. This
is intended to be the official algorithm that gets
put into the W3C Transforms specification.

The old code is renamed with a 4 prefix (indicating
it is a blend between 3d matrices using quaternions),
and new methods and structures for 2d blending were added.

I also took the opportunity to clean up a lot of
bad WebKit style.

* platform/graphics/ca/GraphicsLayerCA.cpp:
(WebCore::maxScaleFromTransform): Use 3d decomposition.
* platform/graphics/transforms/PerspectiveTransformOperation.cpp:
(WebCore::PerspectiveTransformOperation::blend): Ditto.
* platform/graphics/transforms/RotateTransformOperation.cpp:
(WebCore::RotateTransformOperation::blend): Ditto.

* platform/graphics/transforms/TransformationMatrix.cpp:
(WebCore::decompose2): New method to decompose an affine 3d matrix
into X/Y scale + translate, a rotation angle, plus some extracted
a,b,c,d fields from the affine section.
(WebCore::decompose4): New name for the old function.
(WebCore::TransformationMatrix::blend2): Perform linear interpolation
between two 2d decompositions.
(WebCore::TransformationMatrix::blend4): New name for the old function.
(WebCore::TransformationMatrix::blend): Call blend2 or blend4 depending
on the type of matrix.
(WebCore::TransformationMatrix::decompose2): Calls into the decompose2
method above.
(WebCore::TransformationMatrix::decompose4): New name.
(WebCore::TransformationMatrix::recompose2): Recomposes a 3d matrix from
a 2d decomposition.
(WebCore::TransformationMatrix::recompose4): New name.
* platform/graphics/transforms/TransformationMatrix.h: All the changes
for the new methods above.

LayoutTests:

This test was only exercising the fact that our
software decomposition did not match our hardware
decomposition (although that required visual inspection).
Now that our 2d decomposition is correct, update the
test and its expected result.

* animations/transform-non-accelerated-expected.txt:
* animations/transform-non-accelerated.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@156553 268f45cc-cd09-0410-ab3c-d52691b4dbfc